Fossils reveal that penis worms adopted hermit-like behavior 500 million years ago, using hyolith shells as protection from predators. A new study by researchers from Durham University and Yunnan University reveals that penis worms (Priapulida) invented the ‘hermit’ lifestyle, some 500 million years ago, at the rise of the earliest animal ecosystems in the Cambrian … Continue reading Ancient Penis Worms Invented the “Hermit Crab” Lifestyle 500 Million Years Ago